How do I trigger an event in MVC4 using javascript?

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C#

ASP.NET

Javascript

MVC

Hi All,

Please help me..
I have stuck with this code.
I have to do chat application in my project.
For that the candidate should register. once registration is over a chat text box will be visible for him/her to chat.

For this I have created a view which contains two div. one contains registration form and other contains chat text box.
I made one of the div visible at a time programmatically.

For submit registration I wrote an action method Index with annotation HttpPost.
And for updating chat data in the enter key press event, I wrote code in the javascript file. there I checked for the occurrence of enter key. For updating the data I wrote an action method in the controller SubmitChat.

registration completes properly and the chat text box visible. But problem arises when I types some text and press enter. When I press enter the chat text saves (ie it calls the action method SubmitChat). But after saving chat text it automatically redirected to the action method Index (with annotation HttpPost) and again the candidate is registering (saving again).

I dont know what is happening there.. and how it goes there.. Please see the link for the code..[How do I use two post methods in a controller MVC4?]